To the woman sitting behind me with her kid when I saw WATCHMEN two days ago:
Normally, I don't give a crap about the Malaysian rating system. Films that are rated 18 and above in Malaysia are mostly heavily-butchered, and tamer than most films that are rated PG in other countries. So I'm unsurprised that you overlooked the fact that this film is rated 18-PL (for overseas audience, this rating is reserved for films contain more than one element, either violence, sex or political/ religious content) and brought your kid along to see the film with you.